springboot，通过注解获取当前所在注解位置的方法的名称，谢谢

Question

springboot，如何通过注解获取当前所在注解位置的方法的名称，谢谢各位帮忙解答。

Answer 1

假设有两个注解@OpenAPI（类）、@OpenAPIMethod（方法），示例如下

@WebListener
public class SpringContextLoader implements ApplicationContextAware, ServletContextListener {

    private final static Logger logger = LoggerFactory.getLogger(SpringContextLoader.class);

    private static ApplicationContext applicationContext = null;

    @Override
    public void setApplicationContext(ApplicationContext context) throws BeansException {
        applicationContext = context;
    }

    public void contextInitialized(ServletContextEvent sce) {

        // 装载Spring的Context
        try {
            if(applicationContext==null) {
                applicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext());
            }
            logger.info("系统spring配置装载成功~");
        } catch (Exception e) {
            logger.error("系统spring配置装载失败", e);
        }
    }

    /**
     * 通过注解得到类型
     * 
     * @param clazz
     * @return
     */
    public static Map<String, Object> getBeansWithAnnotation(Class<? extends Annotation> clazz) {
        return applicationContext.getBeansWithAnnotation(clazz);

    }


    /**
     * 得到Class中包含有传入Annotation类型的方法
     * 
     * @param clz
     *            Class类型
     * @param annoClz
     *            Annotation类型
     * @return 传入Annotation类型标记的方法
     * @throws Exception
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static List<Method> getClassMethodByAnnotation(Class clz, Class annoClz) throws Exception {

        clz = Class.forName(clz.getName(), true, clz.getClassLoader());

        List<Method> result = new ArrayList<Method>();

        for (Method method : clz.getMethods()) {

            if (method.getAnnotation(annoClz) != null) {
                result.add(clz.getMethod(method.getName(), method.getParameterTypes()));
            }
        }

        return result;
    }

    /**
     * 打印注解对应的方法名
     * @throws Exception
     */
    public static void printMethodName() throws Exception{
        Map<String, Object> openClz = SpringContextLoader.getBeansWithAnnotation(OpenAPI.class);

        if (openClz != null) {
            for (Object clzObj : openClz.values()) {

                List<Method> methodList = getClassMethodByAnnotation(clzObj.getClass(), OpenAPIMethod.class);

                for (Method method : methodList) {

                    String methodName = method.getDeclaringClass().getSimpleName() + "." + method.getName();

                    System.out.println(methodName);
                }
            }
        }
    }
}